The Repository 'https //download __hot__.docker.com/linux/ubuntu Xenial Inrelease' Is Not Signed May 2026

sudo mkdir -p /etc/apt/keyrings curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg sudo chmod a+r /etc/apt/keyrings/docker.gpg Use code with caution. ( Ask Ubuntu , Stack Overflow ). 2. Update the Repository Configuration

The error typically occurs during a sudo apt update when your system cannot verify the authenticity of the Docker repository. This happens because the GPG key is missing, expired, or misplaced in your system's keyring. Core Reasons for the Error sudo mkdir -p /etc/apt/keyrings curl -fsSL https://download

Sometimes a corrupted cache causes the signature error. Clear it before trying to update again: Clear it before trying to update again: If

If you are using a derivative like Linux Mint , the $(lsb_release -cs) command might return a name (like sarah or serena ) that Docker doesn't recognize, requiring you to manually point it to xenial . Stack Overflow ). 2.